Surge Protective Devices Onboard Vessels

MarineLink.com
Monday, April 08, 2013

Surge protective devices (SPDs), more commonly known as surge protectors or power strips, help protect electronic devices from being damaged from excessive currents and allow the delivery of power to multiple devices simultaneously. This safety alert addresses the use of certain electrical protection devices onboard vessels and the inherent risks they may cause. Most commercially available SPDs are designed for use ashore and will interrupt only the hot conductor when a surge occurs. What does that mean for the ship owner/operator? It means that while these devices may provide protection in our homes and offices, these same devices may be fire risks onboard vessels.

A marine casualty investigation of two separate stateroom fires onboard a U.S. Flag Container ship revealed that the sources of the fires were attributed to the use of SPDs plugged into a lighting circuit. It was discovered that a ground had developed on another circuit that was connected to the same distribution panel providing power to the staterooms. This ground created an imbalance of voltage between the two power conductors supplying the SPDs which caused excessive currents, overheating, and subsequently, a fire. In this instance, even if the SPDs automatically tripped as designed, only one power conductor would have been secured while the other would continue to provide power, possibly shorting to the device's ground wire and the structure of the vessel.

For shipboard applications, it is critical for a device to interrupt both power conductors. Underwriters Lab Standard - UL Marine 1449 - addresses this issue and applies to the use of SPDs.

The Coast Guard recommends that vessel Owners, Operators, Class Society Surveyors, Insurers, and other inspection personnel examine the risks associated with the use of SPDs aboard their vessels, and if necessary ensure their organizations have policies and procedures relating to their use.  Vessels should have defined procedures for checking the condition and grounding capabilities of personal/portable electrical equipment, and trained shipboard personnel should be assigned to check and approve all SPDs in use or brought on board for compatibility with the vessel's electrical distribution system prior to use. Routine checks of switchboard and distribution system 120 VAC ground detection systems are necessary to detect the presence of grounds that may cause similar circumstances with non-marine type SPDs. These recommendations are not mandated, rather just an advisory based on lessons learned from the casualty.

www.marineinvestigations.us
 

Maritime Reporter September 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Marine Electronics

Rederij Groen Takes Delivery of 7-Waves

Rederij Groen’s entire SRSV fleet built by Damen Maaskant Shipyards Stellendam. Dutch offshore services company Rederij Groen has taken delivery of the 7-Waves,

General Dynamics is Link Govt-level Security to Consumer Smartphone

General Dynamics C4 Systems recently received the Defense Mobile Classified Capability (DMCC) contract from the National Security Agency (NSA). As part of the contract,

Transas to Supply TechSim Solutions to SUNY Maritime

The Navsim Services and Transas Americas Team, have been awarded contracts for supply of a combination of full mission, classroom and cloud based Transas Technical

Maritime Safety

USCG to Ensure Safety During World Series

The Coast Guard and local agencies are working to ensure the safety of boaters and baseball fans during World Series games at AT&T Park this weekend. The

Navy to Commission Submarine North Dakota

The Navy will commission its newest attack submarine North Dakota, during a ceremony Saturday, Oct. 25, 2014, at Submarine Base New London in Groton, Connecticut.

UN: Ship Inspections near Somalia for Arms, Charcoal

The United Nations Security Council authorized the inspection of boats suspected of carrying illegal shipments of charcoal or weapons to and from Somalia on Friday,

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Standards Pipelines Pod Propulsion Salvage Ship Repair Ship Simulators Shipbuilding / Vessel Construction Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1038 sec (10 req/sec)